HomeFish encyclopediaRay-finned fishesHerringsHerrings, shads and sardinesPacific gizzard shad Pacific gizzard shad (Dorosoma smithi) Scientific name: Dorosoma smithi Hubbs & Miller, 1941 The Pacific gizzard shad (Dorosoma smithi) is a freshwater fish of the family Clupeidae. BiologyDorsal spines (total): 0; Anal spines: 0; Anal soft rays: 22 - 29. Body moderately deep; belly with 15 to 18 + 9 to 12 scutes. Mouth small. Last dorsal fin ray long, but less the distance from snout tip to pelvic fin base; anal fin relatively short. Scales somewhat small, somewhat irregular. A dark spot behind gill opening. Distinguished from Opisthonema species by its anal fin which is longer than head and well behind dorsal fin base.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameDorosoma smithiFamilyClupeidae (Herrings, shads and sardines)OrderClupeiformes (Herrings)ClassActinopterygii (Ray-finned fishes)Maximum length14.0EnvironmentFreshwater; pelagicClimateSubtropicalDistributionNorth America: Pacific drainage of northwestern Mexico (R?o Piaxtla, R?o del Fuerte, R?o Sinaloa system, R?o de Mocorito, R?o Muerto, R?o Yaqui system, i.e. between Sinaloa and Sonora).Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: subsistence fisheriesResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026